CN112981419A - Heat treatment process of cold-extruded cross shaft - Google Patents
Heat treatment process of cold-extruded cross shaft Download PDFInfo
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- CN112981419A CN112981419A CN202110150467.4A CN202110150467A CN112981419A CN 112981419 A CN112981419 A CN 112981419A CN 202110150467 A CN202110150467 A CN 202110150467A CN 112981419 A CN112981419 A CN 112981419A
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- cross shaft
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a heat treatment process of a cold-extruded cross shaft, which relates to the technical field of heat treatment and comprises degreasing, primary heating, strong infiltration, high expansion, intermediate cooling, secondary heating, quenching and tempering. The invention has the beneficial effects that: the cross shaft is subjected to high-expansion treatment, then is subjected to intermediate cooling to 730 ℃, is heated to 890 ℃, is subjected to heat preservation and then is quenched, compared with the background art, the process is simpler, and meanwhile, a direct quenching mode is adopted, and only one time is needed.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to a heat treatment process of a cold-extruded cross shaft.
Background
The universal joint cross shaft is a key part of an automobile universal joint transmission device, and the universal joint cross shaft must have good mechanical property, which requires carburizing and quenching heat treatment on the universal joint cross shaft. However, the conventional cold-extruded cross shaft generates mixed crystals after carburizing and quenching, thereby affecting the overall mechanical properties.
The existing heat treatment process of the cold extrusion cross shaft comprises the following steps: degreasing, heating, strong infiltration, high expansion, low expansion, direct quenching, cleaning, tempering, and then performing secondary quenching, cleaning and tempering. The following disadvantages exist with this process:
1. the process is complex and needs to be quenched twice;
2. secondary heating is needed, so that the cost is high;
3. quenching cracks are easy to generate, and the product quality is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a heat treatment process of a cold-extruded cross shaft, which has the advantages of simple process flow and low production cost.
The purpose of the invention is achieved by the following technical scheme: a heat treatment process of a cold-extruded cross shaft comprises the following steps:
1) degreasing: carrying out surface degreasing treatment on the cold-extruded cross shaft at the temperature of 450 +/-50 ℃;
2) primary heating: after the temperature of the heating furnace is raised to 880 +/-15 ℃, the cross shaft is placed in the heating furnace, and the temperature of the furnace is raised to 890 +/-15 ℃ and is kept;
3) strong infiltration: after the primary heating is finished, the furnace temperature is continuously increased to 900 +/-15 ℃, and the carburization is started, wherein the carburization carbon potential is 1.05 percent;
4) high expansion: after the carburization is finished, reducing the furnace temperature to 890 +/-15 ℃, preserving the temperature, and adjusting the carbon potential to 0.90%;
5) intercooling: after the high expansion treatment, reducing the furnace temperature to 730 +/-120 ℃, and cooling the cross shaft;
6) secondary heating: after the intercooling treatment, raising the temperature of the furnace to 890 +/-15 ℃, carrying out secondary heating and heat preservation on the cross shaft, and adjusting the carbon potential to 0.85%;
7) quenching: quenching the secondarily heated cross shaft, and cleaning after quenching;
8) tempering: tempering the cleaned cross shaft at the temperature of 160 +/-20 ℃, and cooling the tempered cross shaft in air.
As an optimal technical scheme, the heat preservation time is 10-30 min during one-time heating.
Preferably, in the case of the high-strength carburization, the carburization time is 160 min.
As an optimal technical scheme, the heat preservation time is 10-30 min during high-expansion treatment.
As a preferable technical scheme, the cooling time is 10-30 min during the inter-cooling treatment.
As an optimal technical scheme, the heat preservation time is 10-30 min during secondary heating.
As a preferable technical scheme, the tempering time is 100-130 min during the tempering treatment.
As a preferred technical scheme, continuously introducing methanol in the steps 2) to 6), wherein the flow rate of the methanol is 2 +/-0.5L/h.
As a preferable technical scheme, nitrogen is continuously introduced into the steps 2) to 6), and the nitrogen flow is 1.20 +/-0.2 m3/h。
The invention has the beneficial effects that: the cross shaft is subjected to high-expansion treatment, then is subjected to intermediate cooling to 730 ℃, is heated to 890 ℃, is subjected to heat preservation and then is quenched, compared with the background art, the process is simpler, and meanwhile, a direct quenching mode is adopted, and only one time is needed.
Drawings
FIG. 1 is a graph of a thermal treatment process of the present invention.
Detailed Description
The invention will be described in detail below with reference to the following drawings:
example (b): as shown in the attached figure 1, the heat treatment process of the cold-extruded cross shaft comprises the following steps:
1) degreasing: carrying out surface degreasing treatment on the cold-extruded cross shaft at the temperature of 450 +/-50 ℃;
2) primary heating: after the temperature of the heating furnace is raised to 880 +/-15 ℃, the cross shaft is placed in the heating furnace, the temperature of the furnace is raised to 890 +/-15 ℃ again, and heat preservation is carried out for 10-30 min;
3) strong infiltration: after the primary heating is finished, the furnace temperature is continuously increased to 900 +/-15 ℃, and the carburizing is started, wherein the carburizing carbon potential is 1.05 percent, and the carburizing time is 160 min;
4) high expansion: after carburizing is finished, reducing the furnace temperature to 890 +/-15 ℃, preserving the temperature, adjusting the carbon potential to 0.90 percent, and preserving the temperature for 10-30 min;
5) intercooling: after high expansion treatment, reducing the furnace temperature to 730 +/-120 ℃, and cooling the cross shaft for 10-30 min;
6) secondary heating: after the intercooling treatment, raising the temperature of the furnace to 890 +/-15 ℃, carrying out secondary heating and heat preservation on the cross shaft, wherein the heat preservation time is 10-30 min, and adjusting the carbon potential to 0.85%;
7) quenching: quenching the secondarily heated cross shaft, and cleaning after quenching;
8) tempering: and tempering the cleaned cross shaft at the temperature of 160 +/-20 ℃ for 100-130 min, and cooling the tempered cross shaft in air.
Further, continuously introducing methanol in the processes of the step 2) to the step 6), wherein the flow rate of the methanol is 2 +/-0.5L/h; continuously introducing nitrogen in the processes of the steps 2) to 6), wherein the nitrogen flow is 1.20 +/-0.2 m3/h。
The invention adopts the processing mode of quenching after the cross shaft is subjected to high expansion treatment, then the cross shaft is cooled to 730 ℃ in the middle and then is heated to 890 ℃ for heat preservation, compared with the background technology, the process is simpler, and simultaneously, the direct quenching mode is adopted, only one quenching process needs to be carried out, thereby effectively reducing the production energy consumption and greatly reducing the production cost.
It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.
Claims (9)
1. A heat treatment process of a cold-extruded cross shaft is characterized in that: the method comprises the following steps:
1) degreasing: carrying out surface degreasing treatment on the cold-extruded cross shaft at the temperature of 450 +/-50 ℃;
2) primary heating: after the temperature of the heating furnace is raised to 880 +/-15 ℃, the cross shaft is placed in the heating furnace, and the temperature of the furnace is raised to 890 +/-15 ℃ and is kept;
3) strong infiltration: after the primary heating is finished, the furnace temperature is continuously increased to 900 +/-15 ℃, and the carburization is started, wherein the carburization carbon potential is 1.05 percent;
4) high expansion: after the carburization is finished, reducing the furnace temperature to 890 +/-15 ℃, preserving the temperature, and adjusting the carbon potential to 0.90%;
5) intercooling: after the high expansion treatment, reducing the furnace temperature to 730 +/-120 ℃, and cooling the cross shaft;
6) secondary heating: after the intercooling treatment, raising the temperature of the furnace to 890 +/-15 ℃, carrying out secondary heating and heat preservation on the cross shaft, and adjusting the carbon potential to 0.85%;
7) quenching: quenching the secondarily heated cross shaft, and cleaning after quenching;
8) tempering: tempering the cleaned cross shaft at the temperature of 160 +/-20 ℃, and cooling the tempered cross shaft in air.
2. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: and when the heat is heated for the first time, the heat preservation time is 10-30 min.
3. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: and in the case of strong carburization, the carburizing time is 160 min.
4. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: and during high-expansion treatment, the heat preservation time is 10-30 min.
5. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: and in the middle cooling treatment, the cooling time is 10-30 min.
6. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: and during secondary heating, the heat preservation time is 10-30 min.
7. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: the tempering time is 100-130 min during the tempering treatment.
8. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: continuously introducing methanol in the steps 2) to 6), wherein the flow rate of the methanol is 2 +/-0.5L/h.
9. The heat treatment process of a cold-extruded cross shaft of claim 1, wherein: continuously introducing nitrogen in the steps 2) to 6), wherein the nitrogen flow is 1.20 +/-0.2 m3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110150467.4A CN112981419A (en) | 2021-02-03 | 2021-02-03 | Heat treatment process of cold-extruded cross shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110150467.4A CN112981419A (en) | 2021-02-03 | 2021-02-03 | Heat treatment process of cold-extruded cross shaft |
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| CN112981419A true CN112981419A (en) | 2021-06-18 |
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| CN202110150467.4A Pending CN112981419A (en) | 2021-02-03 | 2021-02-03 | Heat treatment process of cold-extruded cross shaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085980A (en) * | 2021-11-12 | 2022-02-25 | 江西振扬精密机械制造有限公司 | Cross shaft heat treatment system and treatment process thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703909A (en) * | 2012-05-24 | 2012-10-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Combined carburizing and quenching process for improving gear performance |
| CN105238910A (en) * | 2015-11-11 | 2016-01-13 | 鲁一军 | Hexagonal axis heat treatment process |
| CN106756756A (en) * | 2016-12-14 | 2017-05-31 | 常州天山重工机械有限公司 | A kind of raising carburizing part case hardness, the technique of control surface tissue dispersion degree |
| CN106835004A (en) * | 2017-01-14 | 2017-06-13 | 山东海利传动机械制造有限公司 | A kind of gear shaft composite step carburizing quenching process |
| CN107653433A (en) * | 2017-09-12 | 2018-02-02 | 厦门真冈热处理有限公司 | A kind of Technology for Heating Processing of automobile gimbal cross axle |
| CN109082628A (en) * | 2018-08-17 | 2018-12-25 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of Gear Carbonization Process and its application |
| CN111962012A (en) * | 2020-09-01 | 2020-11-20 | 天津创真金属科技有限公司 | High-temperature carburization slow-cooling quenching tempering heat treatment method for engineering machinery crawler belt pin bush |
-
2021
- 2021-02-03 CN CN202110150467.4A patent/CN112981419A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703909A (en) * | 2012-05-24 | 2012-10-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Combined carburizing and quenching process for improving gear performance |
| CN105238910A (en) * | 2015-11-11 | 2016-01-13 | 鲁一军 | Hexagonal axis heat treatment process |
| CN106756756A (en) * | 2016-12-14 | 2017-05-31 | 常州天山重工机械有限公司 | A kind of raising carburizing part case hardness, the technique of control surface tissue dispersion degree |
| CN106835004A (en) * | 2017-01-14 | 2017-06-13 | 山东海利传动机械制造有限公司 | A kind of gear shaft composite step carburizing quenching process |
| CN107653433A (en) * | 2017-09-12 | 2018-02-02 | 厦门真冈热处理有限公司 | A kind of Technology for Heating Processing of automobile gimbal cross axle |
| CN109082628A (en) * | 2018-08-17 | 2018-12-25 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of Gear Carbonization Process and its application |
| CN111962012A (en) * | 2020-09-01 | 2020-11-20 | 天津创真金属科技有限公司 | High-temperature carburization slow-cooling quenching tempering heat treatment method for engineering machinery crawler belt pin bush |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085980A (en) * | 2021-11-12 | 2022-02-25 | 江西振扬精密机械制造有限公司 | Cross shaft heat treatment system and treatment process thereof |
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Application publication date: 20210618 |
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